I'm not sure if your looking for more HP or just helping a starving engine breathe at higher altitudes. Even though turbocharged engine is not affected as badly I had to modify my air intake box so it did not restrict flow. With stock box after a hard pull the "Filter minder" was pulled in at least half way. After mod it never moves. Seat of the pants feel is perhaps a little better but cool air from behind bumper should be helping also. No hard data but in theory should be helping. I'm not sure what it would do for a gas engine but I don't think it could hurt. JM2¢, Hank
Engine compartment is too crowded to allow photo after install. Parts are from plumbing dept. at any "Home" store. Of course ... the box is shown upside-down in the photo.
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD
.. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite